JEE Main 2022 · 29 Jul · Shift 1 · Chemistry Q85

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ChemistryInteger+4 / -1Question 85 of 90

If O $_2$ gas is bubbled through water at 303 K, the number of millimoles of O $_2$ gas that dissolve in 1 litre of water is _______. (Nearest Integer)

(Given : Henry's Law constant for O $_2$ at 303 K is 46.82 k bar and partial pressure of O $_2$ = 0.920 bar)

(Assume solubility of O $_2$ in water is too small, nearly negligible)

Your answer

Answer and worked solution

Official answer: 1

Henry's law. $x=\frac{0.920}{46820}=1.96\times10^{-5}$ . In 1 L water (55.5 mol), $n=1.96\times10^{-5}\times55.5=1.09\times10^{-3}$ mol ≈ 1 mmol.

Answer: 1

Topics:Concentration and solubility

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JEE Main 2022 · 29 Jul · Shift 1, Chemistry question 85